Highly Selective Acetylene Semihydrogenation Catalyst with an Operation Window Exceeding 150 °C,ACS Catalysis

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Highly Selective Acetylene Semihydrogenation Catalyst with an Operation Window Exceeding 150 °C
ACS Catalysis ( IF 11.3 ) Pub Date : 2021-05-04 , DOI: 10.1021/acscatal.1c00804
Baohui Lou ₁ , Hongquan Kang ₁ , Wentao Yuan ₂ , Lu Ma ₃ , Weixin Huang ₄ , Yong Wang ₂ , Zheng Jiang ₅ , Yonghua Du ₃ , Shihui Zou ₁ , Jie Fan ₁

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The operating window (OW) is a primary performance criterion for the selective hydrogenation of acetylene in excess ethylene. Currently, most state-of-the-art catalyst systems have an OW of less than 50 °C in front-end processes. Selective acetylene hydrogenation catalysts with an OW wider than 100 °C are rare. Here, we demonstrate a facile stepwise chemical method to synthesize calcite-supported PdBi intermetallic compounds (PdBi/Calcite) that feature isolated and electron-rich Pd atoms as active sites for acetylene hydrogenation. Beneficial from the extremely weak ethylene absorption abilities and the stable structures against the formation of β-PdH_x, PdBi/Calcite exhibit >99% selectivity to C₂H₄ in the whole temperature range tested (50–300 °C) and ∼100% C₂H₂ conversion from 150 to 300 °C. As a result, an operation window exceeding 150 °C has been achieved.

中文翻译：

操作窗口超过150°C的高选择性乙炔半氢化催化剂

操作窗口（OW）是过量乙烯中乙炔选择性加氢的主要性能标准。当前，大多数最先进的催化剂系统在前端工艺中的OW均低于50°C。OW大于100°C的选择性乙炔加氢催化剂很少。在这里，我们演示了一种易于操作的逐步化学方法，用于合成方解石负载的PdBi金属间化合物（PdBi /方解石），该化合物具有分离的且富电子的Pd原子作为乙炔加氢的活性位点。有益从极弱的乙烯吸收能力和抗β-PDH的形成稳定的结构_X，PdBi /方解石表现出> 99％的选择性至C ₂ ħ ₄在所测试的整个温度范围（50-300℃）和〜100 ％ C从150°C到300°C的₂ H ₂转化率。结果，实现了超过150℃的操作窗口。

更新日期：2021-05-22

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